#include<iostream>
#include<cmath>
#include"coordin.h"
polar rect_to_polar(rect xypos)
{
    using namespace std;
    polar answer;
    answer.distance=sqrt(xypos.x*xypos.x+xypos.y*xypos.y);
    answer.angle=atan2(xypos.y,xypos.x);
    return answer;
}
void show_polar(polar dapos)
{
    using namespace std;
    const double PI = 3.1415926;
    const double Rad_to_deg=180/PI;
    cout<<"distance="<<dapos.distance;
    cout<<",angle="<<dapos.angle*Rad_to_deg;
    cout<<"degree\n";
}